package com.ecust.jvm4;

import org.junit.After;

import org.junit.Assert;

import org.junit.Before;

import org.junit.Test;







public class PostfixExprTest {



	@Before

	public void setUp() throws Exception {

	}



	@After

	public void tearDown() throws Exception {

	}



	@Test

	public void testEvaluate() {

		{

			PostfixExpr expr = new PostfixExpr("6 5 2 3 + 8 * + 3 + *");

			Assert.assertEquals(288, expr.evaluate(),0.0f);

		}

		{

			//9+(3-1)*3+10/2

			PostfixExpr expr = new PostfixExpr("9 3 1-3*+ 10 2/+");

			Assert.assertEquals(20, expr.evaluate(),0.0f);

		}

		

		{

			//10-2*3+50

			PostfixExpr expr = new PostfixExpr("10 2 3 * - 50 +");

			Assert.assertEquals(54, expr.evaluate(),0.0f);

		}

	}



	@Test

	public void testTo(){

		String poseExpr = InfixToPostfix2.toPostFixExpr("10-2*3+50");

		System.out.println(poseExpr);

	}



}
